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The Effect of Saliva on Bacteria

The Effect of Saliva on Bacteria. Mackenzie Abate 9 th Grade. Problem. Does saliva have an effect on bacteria? If so, what is this effect?. Research. E. coli. B. c ereus. Gram positive Facultative anaerobe Beta hemolysis Food- bourne illnesses

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The Effect of Saliva on Bacteria

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  1. The Effect of Saliva on Bacteria Mackenzie Abate 9thGrade

  2. Problem • Does saliva have an effect on bacteria? • If so, what is this effect?

  3. Research E. coli B. cereus Gram positive Facultative anaerobe Beta hemolysis Food-bourne illnesses Produces a emetic toxin: ETE; three enterotoxins: NBL, Nhe and EntK • Gram negative • Facultative anaerobe • Heterotrophic • Mixed acid fermentation: lactate, succinate, ethanol, carbon dioxide and acetate • Motile • Conjugation, transformation and transduction

  4. Research S. mutans S. epidermidis Gram negative Non-motile Facultative anaerobe Grows on plastic objects in body Produces slime • Gram positive • Heterotrophic • Metabolizes sucrose to lactic acid • Allowed to grip to teeth because of receptors • Found mainly on teeth

  5. Research Human Saliva Dog Saliva • 98% water • Digestion and disinfectants

  6. Research Cat Saliva Amylase

  7. Lysosime

  8. Hypothesis

  9. Materials • Bacteria: Bacillus cereus, Escherichia coli, Staphylococcus epidermidis and Streptococcal mutans • Controls: Amylase, Lysozyme,

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